The Philippines earthquake of July 16, 1990

Report on field visit by the NZNSEE reconnaissance team

  • D. C. Hopkins KRTA Ltd, Wellington, New Zealand
  • W. D. Clark Morrison Cooper Ltd, Wellington, New Zealand
  • T Matuschka Engineering Geology, Auckland, New Zealand
  • J. C. Sinclair Sinclair Group Architects, Auckland, New Zealand


On July 16 1990, an earthquake of magnitude 7.8 caused widespread damage, disruption and loss of life in Central Luzon, north of Manila.

This report presents the observations of a four person reconnaissance team (three engineers and an architect) sent to the Philippines two weeks after the earthquake, by the New Zealand National Society for Earthquake Engineering.

A summary and conclusions are presented first, with more detailed information following.


"Assessment of Reconstruction Costs of Earthquake Damaged Public Infrastructure on Luzon (July 16, 1990 Earthquake)" Department of Public Works and Highways September 1990. Report by Coffey and Partners International and URS International Inc, sponsored by Asian Development Bank.

Punongbayan R (1987), "Briefing on the Major Faults near Major Dams in the Philippines". Report to the National Power Corporation.

Punongbayan R (1989), "Earthquakes and Tsunami", Report Philippines Institute of Volcanology and Seismology.

Hamburger MW, Cardwell R Kand Isacks B L (1980), "Seismotectonics of the Northern Philippine Island Arc", in the Tectonics and Geologic Evolution of Southwest Asian Seas and Islands, Part 2, edited by DE Hayes, American Geophysical Union, Geophysics Monograph 27.

Idriss IM (1985), "Evaluating Seismic Risk in Engineering Practice", Proc. 11th Int.Conf. on Soil Mechanics and Foundation Engineering, Vol.1, pp 235- 320.

Seed H B, Murarka R, Lysmer J and Idriss I M (1975), "Relationships between Maximum Acceleration, Maximum Velocity, Distance from Source and Local site conditions for Moderately Strong Earthquakes", Bull Seismological Society America, Vol. 66, No.4, pp 1323-1342.

Newhall CG, Sharp RV, Wieczorek G F, Wennerberg L and Bicknell J (1990), "The July 16, 1990, Luzon Earthquake".

Hirano S, Nakata T and Sangawa A (1986), "Fault Topography and Quaternary Faulting along the Philippine Fault Zone, Central Luzon", Philippines Journal of Geography, Vol 95, pp 71-93. DOI:

Fucik E and Edbrooke F E (1960), "Ambuklao Rockfill Dam, Design and Construction", Transactions ASCE Vol 125, Part I, pp 1207-1227.

Abelardo B Carrillo, "Structural Design Data and Specifications". Sixth Edition dated 5 January 1980. Published by KEN Incorporated, Quezon City Philippines.

How to Cite
Hopkins, D. C., Clark, W. D., Matuschka, T., & Sinclair, J. C. (1991). The Philippines earthquake of July 16, 1990. Bulletin of the New Zealand Society for Earthquake Engineering, 24(1), 3-95.